Incandescent lamp.



no. 629,198; I Pa ianted July l8, I899.

- A; H. MILLER.

,INOANDESCENT LAMP.

(Application med sew/22, 1.898. (H0 mm.)- 2 Sheets-Shoat I.-

. gglmuinnmm-g wifxiim zmugmunmw /N VENTOH No. 629,193. Patented July 18, I899.

- A. u. MILLER.

HICANDESCENT- LAHP.

(Application and Sept. 22, 189g. (Io mam 2 shuts-Sheet 2.

WITNESSES: I/v NT By I A TTOHNEYS;

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UNITED STATES PA-rnN'r OFFICE.

ANDREW 1i. MILLER, OF CENTRAL OITY, OOLORADO, ASSIGNOR, BY DIREOT AND MESNE ASSIGNMENTS, TO THE-MILLER IMPROVED INCANDESOENT LAMP COMPANY, OE DENVER, COLORADO.

lN CAND'ES C ENT LAM P.

SPEOIEI ATION forming part of Letters Paar No. 629,198, dated July 18, 189 9. Application filed September 22, 1395. Serial H0. 691,622. (No model.)

This specification is the disclosure of several forms of my invention, while the'claims I define the actual scope of the invention.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding'parts in all the figures.

Figure 1 is an elevational view of the invention. Fig. 2 is a sectionalview on the line 2 2 of Fig. 1.- Fig. 3 is a sectional view on the line 3 3 of Fig. 1. Fig. 4 is a sectional view on the line 4 4 of Fig. 1.' Figs. 5, 6, and 7 are diagrammatic views illustrating three adjustments of the connections. Fig. 8 is an elevational view illustrating a slight modification in the form of the'filament, and Figs.

9 and 10 are diagrammatic views showing two 0 of the adjustments of the form shown in Fig.8.

Referring to the first seven figures, my improvements may be adapted to a base of the usual form, in which the positive pole is the contact '11 and in which the negative pole is the metallic sheathing 12 of the base of the lamp. The base of the lamp is formed with two annular ribs 14, between which is held to move circumferentially an insulating-ring 15,

provided with two contact-wires 16 and 17.

This ring 15 may beturnedaround on the base to any position, so as to efiect the various adjustments of the lamp, as will be fully described hereinafter.

The lamp is provided with a double filament, the sections 18 and 19 thereof being joined to a common leader 20, that passes up into the base and has electric connection with a spring contact-finger 21 on the. base at a point directly beneath the ring 15. The other end of the filament-section 19 is connected with a leader 22, that passes up through the base of the socket and is electrically joined to the sheathing 12 of the base. Theend of the filament-section 18 that is not connected with the leader 20 is connected with a leader 55, 23, which passes up into the base and is electrically joined to a springcontact-finger 24 similar to the finger 21 and similarly Situ 'ated. A leader 25 passes down from the contact 11 and is electrically connected with a spring contact-finger 26 similar to the fingers 21 and 24 and similarly situated. A fourth spring contact-finger 24, similar to those previously described, is connected with a leader .2 8, that passes up into the base and is electrically joined to the sheathing 12. It will thus be seen that there are. four spring contact-fingers 21, 26, 24, and 27, all of which are arranged in the same circumferential line immediately below the ring 15, so that varione connections may be made between the brings into play only one of thefilament-sections-for example, the filament-section 19. This adjustment is effected by turning the ring 15 so that the contact-wire 17 will bear betweenthe fingers 21 and 26. The current now entering from the positive contact 11 passes down the leader 25 and runs through the finger 26, contact-wire 17, and finger 21, and from such wire passes-by the leader 20 into the filament-section 19. From the sec- 0 tion' 19 the current passes by the leader22 to the sheathing 12 of the base.

The adjustment shown in Fig. 6 is such as throws into circuit both'filament-sections in a manner so that there is given forth the maxi- 5 mum power of the lamp. The adjustment here is such as causes the contact-wire 17 to engage between the fingers 24: and 27 and the contact-wire 16 to engage between the fingers *21 311(126. The current passing from-the IOQ '2 sans positive contact 11 runs. through the leader 25 to the contact-finger 26, contact-wire 16,

and'finger2l,and passes from the finger 21. by the leader 'to bothsectionslB and 19 of I :this adj ustmentthat is, that shown in Fig.

current and producing a dimmed light.

G-both filament-sections are employed to exercise the maximum capacity of the lamp,

which :is dueto the fact that the'current is divided and passes half through each fila merit-section. 7

Theadjustnient shown in Fig employs both filament-sections, but causes the cur rent to be passed wholly through both section's,thus oiferin g a greater resistance to the In 7 this adjustment the contact wire 17' is made to bear between the fingers26 and: 24, so that 5 the current passing in from the positive contact 11 flows through the leader to the fin I ger 26, through thecontact-wirefl? to thefin .ger 24, from the finger 24 to the leader 23, to the section 18, from the section 18 tothe sec-.

tion 19, and from the section 19 by theleader 22 to the sheathing 12 of the base.

'It will thus be seen that by means of my lamp may be attained and three distinct candle-powers exercised. This renders the lamp especially advantageous in hotels and hospitals where it is desired to vary the power of the lamp, and since it is possible to adapt the invention to the ordinary base it is clear that the invention may beemployed without undue expense.

In Fig. 8 there is showna' filament which is practically continuous'and in which there is not that marked division into sections as in Figs. 1 to 7. In Fig. 8 the filament 29 is looped once within the globe and joined to the leader 20 at approximatelyits middle. This form does not differ in any essentiality from that previously described, the adjustment and operations being practically the same. Figs. 9 and 10 correspond, respectively, to the adjustments shown in Figs. 6 and 7. It is also possible, of course, to effect that adjustment shown in Fig. 5.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. An incandescent lamp having a base with a positive contact-point, a filament, a.

leader passing from the positive contactpoint, a contact-finger with which said leader is connected, a second contact-finger, a leader passing fromthe second contact-finger and connected with the filament at 'a point intermediate the length thereof, a leader passing from'one'e'nd of the filament to the base sheathing, a third contact-finger, a'leadcrbetween the third contact=finger and the remaining' end ot the. filament, a fourth contact-finger, a'leader between the fourth contact finger and the base-sheathiug, a ring a turning on the base, and contact-wires held on and movingwith the ring and coacting with the several contact-fingers. I

2. An incandescent lamp having a filament, a leader connected to'the filament at a point intermediate the length thereof, a contact on the base of the lamp with which saidleader is connected, a feed-leader, a second contact on the base of the lamp and in connection with the feed-leader, a third contactin con-- ncction with one end of the filament, the 7 other end of the filament being in connection with the base-sheathin g, afourth contact-fin ger also in connection with the base-sheathing, a ring turning on' the base, and contacts on the ringand coacting with the several contact-fingers. I

3. An incandescent'lamp havingabase, a feed or'positive leader running in the same, a stationarycon tact on the base with which said with the filament at a point intermediate the lengththereof,a third stationary contact on the base and in connection with one end of thefilament, a leader passing from the other end of the filament to the sheathing of the base, a fourth stationary contact on the base and in connection with the sheathing of the base, a member adjustable on the base, and two contacts carried thereby and coacting with the four stationary contacts to throw the filament, in whole or in part, into circuit.

4. An incandescent lamp having a filament in two sections, the sections being in connection with a common leader, a contact-finger on the base of the lamp with which said common leader is connected, a feed-leader, a second contact-finger on the base of the lamp and connected with the feed-leader, a third contact-finger in connection with one section ,of the filament, a leader passing from the other section of the filament and connected with the sheathing of the base, a fourth eontact-finger in connection with the sheathing 'of the base, a ring turning on the base, and

two contact-wires held on the ring and coacting with the four contact-fingers to throw the sections, in whole or in part, into circuit.

"feed-leader is connected, afilament, a second stationary contact on the base and connected 

